During his confirmation hearings in January, Sessions, however, did not mention his conversations with Sergey Kislyak.

At the time of the hearings, some Americans considered Russia an antagonist because of numerous reports of its interference in the US election. Here's how Sessions answered questions during his confirmation hearings on interacting with Russian officials:

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SEN. AL FRANKEN: "If there was any evidence that anyone affiliated with the Trump campaign communicated with the Russian government in the course of this (2016) campaign, what would you do?," the Minnesota Democrat asked.

SESSIONS: "I'm not aware of any of those activities. I have been called a surrogate at a time or two in that campaign and I did not have communications with the Russians."

DATE: January 10

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SEN. PATRICK J. LEAHY: Several of the President-elect's nominees or senior advisers have Russian ties. Have you been in contact with anyone connected to any part of the Russian government about the 2016 election, either before or after election day?" the Vermont Democrat asked in a questionnaire.

SESSIONS: No.

DATE: January 10

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Sessions was a senator and a top Trump surrogate when he met the ambassador twice -- in July on the sidelines of the Republican National Convention and in September when he was a member of the Senate armed services committee.

In a statement Thursday, he said reports that he met Russian officials are false.

"I never met with any Russian officials to discuss issues of the campaign. I have no idea what this allegation is about," he said.

US intelligence officials consider Kislyak a top spy and spy recruiter, according to current and former senior US government officials. Russia's foreign affairs ministry denied the characterization.